Heinrich talla



H. TALLA. PROCESS AND DEVICE FOR CASTING METALS AND OTHER MATERIALS UNDER AN EXPLOSIVE LIKE PRESSURE INTO MOLDS.

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UNITED STATES PATENT OFFICE.

HEINRICH TALLA, OF I-IEILBRONN-ON-THE-NECKAR, GERMANY, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE CHEMICAL FOUNDATION, INC, A CORPORATION OF DELA.

WARE.

PROCESS AND DEVICE FOR CASTING METALS AND OTHER MATERIALS UNDER AN V EXPLOSIVE-LIKE PRESSURE INTO MOLDS.

Specification of Letters Patent.

Patented Mar. 29, 1921.

Applicaicion filed March 8, 1917. Serial No. 153,425.

T 0 all whom it may concern:

Be it knownthat I, HEINRICH TALLA, a resident of Heilbronn-on-the-Neckar, Germany, have made an invention ofcertain new and useful Improvements in Processes and Devices for Casting Metals and other Materials Under an EXpl0SlV6-Llk6 Pressure into Molds, of which the following is a full, clear, and exact description.

The present invention refers tothe casting of metals and other materials adapted to be cast in molds, and more especially to the particular method of casting metal and the like under the action of an explosion like pressure. Its particular object is to improve this method of casting so as to get a superior product.

With the old process of casting metal and the like in molds with the aid of an explosion-like pressure acting upon the liquid metal there is the disadvantage that the rapidly increasing pressure will also decrease very quickly. Thus, although to the metal to be pressed into the mold there is imparted an instantaneous acceleration, the pressure does not last long enough. lasting pressure Which-need not be as high as the initial explosion pressure would be of great value in driving the whole mass of the metal which had previously been somewhat disintegrated, into the mold with additional force. Such lasting pressure maybe produced by connecting the vessel to contain the molten metal, with a cylinder of compressed gas. The metal would be held together by such lasting pressure and the formation of pores which takes place easily through the effect of pulverization produced by the shock of the instantaneous pressure would be totally avoided or at least diminished to negligible quantity.

In accordance. with the foregoing, the

process according to the present invention and two lasting pressures preceding and succeeding the explosion-pressure.

The accompanying drawing sets forth an illustrative embodiment of an apparatus by means of which my invention may be carried into practical effect, said drawing bemg a vertical section.

The manufacture of uniform non-porous castings may be accomplished in a furnace a within which is placed a receptacle for the molten metal, such as the crucible Z). The crucible b is provided with an outlet at its base, which outlet may be opened and closed by a valve (Z actuated by a lever joined to a rod member 0 which in turn carries the valve (Z. The outlet from the crucible c0mmunicates by means of a channel 71 with a chamber 6 from which the molten metal is forced, through a communicating channel and a nipple f under the impelling force of a current of compressed gas admitted through pipes 70 and into a mold (not shown) with explosive violence.

The metal maintained in a molten condition in the crucible is allowed to flow by the channel iin portions depending upon the casting to be made-to the chamber 6. From chamber 6 it is forced by a current of compressed gas from 9 through a channel and nipple f to the mold. It, of course, will be understood that the pressure exerted by the gas may be allowed to act during such intervals as will give a uniform casting.

In practising the invention one may use for instance a casting device having a steel tube filled with compressed gas such as carbonic acid gas connected to it, a suitable valve being inserted between the gas container and the casting device. Whenever metal shall be cast in the mold, the valve 2. A process of casting metal and the like into molds which consists in subjecting the molten metal while it is entering the mold to fluid pressure produced by an explosion and to a lasting gas pressure preceding the pressure produced by the explosion.

3. A process of casting metal and the like into molds which consists in subjecting the molten metal to pressure produced by an explosion, and to lasting pressure succeeding the said explosion pressure.

4-. A process of casting metal and the like into molds which consists in subjecting the molten metal to the pressure of an explosion and to a lasting gas pressure acting simultaneously with the explosion pressure.

5. A process of casting metal and the like into molds which consists in subjecting the molten metal to pressure produced by an explosion and to lasting gas pressure preceding and succeeding the explosion pressure.

6. A process of casting metal and the like into molds which consists in subjecting the molten metal to the pressure of the gaseous product of an explosion and to a lasting gas pressure succeeding the instantaneous pressure and operating a valve through which the lasting pressure gas is introduced, in coincidence with the explosion.

7. A process of casting metal which comprises subjecting a metal in a mold to instantaneous gas pressure produced by an explosion in a confined space in communication with said mold while also subjecting the said metal to gas pressure from an extraneous source, before, during and after the said instantaneous pressure.

In testimony whereof I aiiix my signatur in presence of two witnesses.

HEINRICH TALLA.

Witnesses:

FRIDA BLEUBER, ERNEST ENTENMAN. 

